summaryrefslogtreecommitdiff
path: root/progs/egl/eglut/eglut.c
blob: 0bfd5d5b067a9a0e77ea840ff5f5a1ce746a3a3a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <sys/time.h>

#include "EGL/egl.h"
#include "EGL/eglext.h"

#include "eglutint.h"

static struct eglut_state _eglut_state = {
   .api_mask = EGLUT_OPENGL_ES1_BIT,
   .window_width = 300,
   .window_height = 300,
   .verbose = 0,
   .num_windows = 0,
};

struct eglut_state *_eglut = &_eglut_state;

void
_eglutFatal(char *format, ...)
{
  va_list args;

  va_start(args, format);

  fprintf(stderr, "EGLUT: ");
  vfprintf(stderr, format, args);
  va_end(args);
  putc('\n', stderr);

  exit(1);
}

/* return current time (in milliseconds) */
int
_eglutNow(void)
{
   struct timeval tv;
#ifdef __VMS
   (void) gettimeofday(&tv, NULL );
#else
   struct timezone tz;
   (void) gettimeofday(&tv, &tz);
#endif
   return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}

static void
_eglutDestroyWindow(struct eglut_window *win)
{
   if (_eglut->surface_type != EGL_PBUFFER_BIT &&
       _eglut->surface_type != EGL_SCREEN_BIT_MESA)
      eglDestroySurface(_eglut->dpy, win->surface);

   _eglutNativeFiniWindow(win);

   eglDestroyContext(_eglut->dpy, win->context);
}

static EGLConfig
_eglutChooseConfig(void)
{
   EGLConfig config;
   EGLint config_attribs[32];
   EGLint renderable_type, num_configs, i;

   i = 0;
   config_attribs[i++] = EGL_RED_SIZE;
   config_attribs[i++] = 1;
   config_attribs[i++] = EGL_GREEN_SIZE;
   config_attribs[i++] = 1;
   config_attribs[i++] = EGL_BLUE_SIZE;
   config_attribs[i++] = 1;
   config_attribs[i++] = EGL_DEPTH_SIZE;
   config_attribs[i++] = 1;

   config_attribs[i++] = EGL_SURFACE_TYPE;
   config_attribs[i++] = _eglut->surface_type;

   config_attribs[i++] = EGL_RENDERABLE_TYPE;
   renderable_type = 0x0;
   if (_eglut->api_mask & EGLUT_OPENGL_BIT)
      renderable_type |= EGL_OPENGL_BIT;
   if (_eglut->api_mask & (EGLUT_OPENGL_ES1_BIT | EGLUT_OPENGL_ES2_BIT))
      renderable_type |= EGL_OPENGL_ES_BIT;
   if (_eglut->api_mask & EGLUT_OPENVG_BIT)
      renderable_type |= EGL_OPENVG_BIT;
   config_attribs[i++] = renderable_type;

   config_attribs[i] = EGL_NONE;

   if (!eglChooseConfig(_eglut->dpy,
            config_attribs, &config, 1, &num_configs) || !num_configs)
      _eglutFatal("failed to choose a config");

   return config;
}

static struct eglut_window *
_eglutCreateWindow(const char *title, int x, int y, int w, int h)
{
   struct eglut_window *win;
   EGLint context_attribs[4];
   EGLint api, i;

   win = calloc(1, sizeof(*win));
   if (!win)
      _eglutFatal("failed to allocate window");

   win->config = _eglutChooseConfig();

   i = 0;
   context_attribs[i] = EGL_NONE;

   /* multiple APIs? */

   api = EGL_OPENGL_ES_API;
   if (_eglut->api_mask & EGLUT_OPENGL_BIT) {
      api = EGL_OPENGL_API;
   }
   else if (_eglut->api_mask & EGLUT_OPENVG_BIT) {
      api = EGL_OPENVG_API;
   }
   else if (_eglut->api_mask & EGLUT_OPENGL_ES2_BIT) {
      context_attribs[i++] = EGL_CONTEXT_CLIENT_VERSION;
      context_attribs[i++] = 2;
   }

   context_attribs[i] = EGL_NONE;

   eglBindAPI(api);
   win->context = eglCreateContext(_eglut->dpy,
         win->config, EGL_NO_CONTEXT, context_attribs);
   if (!win->context)
      _eglutFatal("failed to create context");

   _eglutNativeInitWindow(win, title, x, y, w, h);
   switch (_eglut->surface_type) {
   case EGL_WINDOW_BIT:
      win->surface = eglCreateWindowSurface(_eglut->dpy,
            win->config, win->native.u.window, NULL);
      break;
   case EGL_PIXMAP_BIT:
      win->surface = eglCreatePixmapSurface(_eglut->dpy,
            win->config, win->native.u.pixmap, NULL);
      break;
   case EGL_PBUFFER_BIT:
   case EGL_SCREEN_BIT_MESA:
      win->surface = win->native.u.surface;
      break;
   default:
      break;
   }
   if (win->surface == EGL_NO_SURFACE)
      _eglutFatal("failed to create surface");

   return win;
}

void
eglutInitAPIMask(int mask)
{
   _eglut->api_mask = mask;
}

void
eglutInitWindowSize(int width, int height)
{
   _eglut->window_width = width;
   _eglut->window_height = height;
}

void
eglutInit(int argc, char **argv)
{
   int i;

   for (i = 1; i < argc; i++) {
      if (strcmp(argv[i], "-display") == 0)
         _eglut->display_name = argv[++i];
      else if (strcmp(argv[i], "-info") == 0) {
         _eglut->verbose = 1;
      }
   }

   _eglutNativeInitDisplay();
   _eglut->dpy = eglGetDisplay(_eglut->native_dpy);

   if (!eglInitialize(_eglut->dpy, &_eglut->major, &_eglut->minor))
      _eglutFatal("failed to initialize EGL display");

   _eglut->init_time = _eglutNow();

   printf("EGL_VERSION = %s\n", eglQueryString(_eglut->dpy, EGL_VERSION));
}

int
eglutGet(int state)
{
   int val;

   switch (state) {
   case EGLUT_ELAPSED_TIME:
      val = _eglutNow() - _eglut->init_time;
      break;
   default:
      val = -1;
      break;
   }

   return val;
}

void
eglutIdleFunc(EGLUTidleCB func)
{
   _eglut->idle_cb = func;
}

void
eglutPostRedisplay(void)
{
   _eglut->redisplay = 1;
}

void
eglutMainLoop(void)
{
   struct eglut_window *win = _eglut->current;

   if (!win)
      _eglutFatal("no window is created\n");

   if (win->reshape_cb)
      win->reshape_cb(win->native.width, win->native.height);

   _eglutNativeEventLoop();
}

static void
_eglutFini(void)
{
   eglTerminate(_eglut->dpy);
   _eglutNativeFiniDisplay();
}

static void
_eglutDefaultKeyboard(unsigned char key)
{
   if (key == 27) {
      /* XXX it causes some bug in st/egl KMS backend */
      if ( _eglut->surface_type != EGL_SCREEN_BIT_MESA)
         eglMakeCurrent(_eglut->dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
      _eglutDestroyWindow(_eglut->current);
      _eglutFini();

      exit(0);
   }
}

int
eglutCreateWindow(const char *title)
{
   struct eglut_window *win;

   win = _eglutCreateWindow(title, 0, 0,
         _eglut->window_width, _eglut->window_height);

   win->index = _eglut->num_windows++;
   win->reshape_cb = NULL;
   win->display_cb = NULL;
   win->keyboard_cb = _eglutDefaultKeyboard;
   win->special_cb = NULL;

   if (!eglMakeCurrent(_eglut->dpy, win->surface, win->surface, win->context))
      _eglutFatal("failed to make window current");
   _eglut->current = win;

   return win->index;
}

int
eglutGetWindowWidth(void)
{
   struct eglut_window *win = _eglut->current;
   return win->native.width;
}

int
eglutGetWindowHeight(void)
{
   struct eglut_window *win = _eglut->current;
   return win->native.height;
}

void
eglutDisplayFunc(EGLUTdisplayCB func)
{
   struct eglut_window *win = _eglut->current;
   win->display_cb = func;

}

void
eglutReshapeFunc(EGLUTreshapeCB func)
{
   struct eglut_window *win = _eglut->current;
   win->reshape_cb = func;
}

void
eglutKeyboardFunc(EGLUTkeyboardCB func)
{
   struct eglut_window *win = _eglut->current;
   win->keyboard_cb = func;
}

void
eglutSpecialFunc(EGLUTspecialCB func)
{
   struct eglut_window *win = _eglut->current;
   win->special_cb = func;
}